As the custody battle between Britney and Kevin rages on, child welfare investigators have been called in to look into "multiple child abuse and neglect" abuse allegations, according to court documents released Tuesday.

An attorney for the L.A. County Department of Children and Family Services wrote that there are concerns about the safety and welfare of the couple’s two toddlers, Sean Preston, 2, and Jayden James, 1, if they are left in their mother’s care.

The agency requested the court not alter the current custody and visitation arrangements until their investigation is completed. Federline currently has temporary custody of the boys after Spears defied court orders about regular drug testing, and Spears pays Federline $15,000 per month in child support.

Calls to attorneys representing Spears and Federline were not immediately returned.